Well, this is weird. I just stumbled across a way, on my machine anyway, to hide the ViEmu bar whether ViEmu is enabled or disabled. I guess it shows the complexity of writing an add-in for Word. ;-)
1. Split the screen. (Don't know what it's called, but drag the line thingie above the document vertical scrollbar but below the toolbar.)
2. Click alternately on the top window and bottom window, observing the ViEmu bar at the bottom of each pane.
3. Go back to a single window by dragging the divider back to the top.
It doesn't seem to happen all the time, but sometimes the ViEmu bar does not show. To get it to come back, press <Ctrl><Shift><Alt>V repeatedly until it shows up.
I had enough problems generating about 300 pages of a 500 page Word document automatically from an MS Access DB. Glad I'm not the one who has to work with Word at the add-in level! ;-)